[单选题]
A runner ran the marathon (approximately 42.0 km) in 2 hours t3k2:) ls.rl,ffo wf p 3;qgwsand 57 miw(djd*xd5 tgu s:6q9f -ozv(qn. What is thzw(tog (x*:jqdv 6-5sddf9 uqe average speed of the runner in m/s?
A. $14.2 \times 10^{3} \; m/s$
B. 124 m/s
C. 3.95 m/s
D. 14.2 m/s
